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EQ to Boost or Reduce

I'm working on a sound system in a skating rink, and I've heard that when it comes to the system eq, it's better to Cut eq frequencies instead of boosting them, however this system sounds real flat especially when the DJ's spin vinyl. Would it be Ok to slightly boost (+3 or 4 db) a few frequencies on the EQ to make this system sound better. FYI all speakers have been repaired and are working at this time.